package apitest;

import java.util.StringJoiner;

public class test2 {
    public static void main(String[] args) {
        StringBuilder stringBuilder = new StringBuilder();
        String string = stringBuilder.append("dawd").append("daaa").reverse().toString();
        System.out.println(string);
        StringJoiner stringJoiner = new StringJoiner(",", "(", ")");
        String s = stringJoiner.add("d").add("f").add("g").toString();
        System.out.println(s);
    }
}
